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Abstract:

A heat dissipation device includes a base and a plurality of fins. Two
latch parts project from a top surface of the base, the two latch parts
cooperatively define a recess therebetween. Each fin defines a tenon at a
bottom portion. The tenon has a configuration in complement with that of
the recess. The latch parts located between two neighboring fins is
punched to make the fins fix on the base.

Claims:

1. A heat dissipation device comprising: a base comprising two latch
parts projecting from a top surface thereof, the two latch parts
cooperatively defining a recess therebetween; and a plurality of fins
each defining a tenon at a bottom portion thereof, the tenon having a
configuration in match with that of the recess, the latch parts located
between two neighboring fins being punched to make the fins fix on the
base.

2. The heat dissipation device of claim 1, wherein each latch part
comprises a latch portion, and the latch portion has a V-shaped cross
section before punching.

3. The heat dissipation device of claim 2, wherein the latch portion of
the latch part located between two neighboring fins is punched and
distorted to flat.

4. The heat dissipation device of claim 1, wherein the latch part
comprises a latch portion and a supporting portion connected to the latch
portion and the top surface of the base.

5. The heat dissipation device of claim 1, wherein the latch part has a
Y-shaped cross section before punching.

6. The heat dissipation device of claim 5, wherein the latch portion of
the latch part is punched and distorted to be T-shaped.

7. The heat dissipation device of claim 1, wherein the latch part is
integrally formed with the base as a single piece.

8. The heat dissipation device of claim 1, wherein a flange bends
horizontally from a bottom of each tenon, and each flange abuts against a
bottom of the recess.

9. The heat dissipation device of claim 1, wherein the latch part extends
longitudinally along the base.

10. The heat dissipation device of claim 1, further comprising a heat
pipe, wherein the heat pipe comprises an evaporation section and a
condensation section connecting with the evaporation section, a bottom
surface of the base defines a groove for receiving the evaporation
section of the heat pipe, and the condensation section of the heat pipe
extends through the fins.

11. A method for assembling a heat dissipation device, comprising:
providing a plurality of fins, each fin defining a plurality of wedged
tenons at a bottom portion thereof; providing a base, a plurality of
latch part projecting from a top surface of the base, a recess being
defined between every two neighboring latch parts, each recess having a
configuration in match with that of the corresponding tenon; receiving
the tenons of each fin in the recess of the base; and punching the latch
part located between two neighboring fins to make the fins fix on the
base.

12. The method of claim 11, wherein each latch part comprises a latch
portion, and the latch portion has a V-shaped cross section before
punching.

13. The method of claim 12, wherein the latch portion of the latch part
located between two neighboring fins is punched and distorted to flat.

14. The method of claim 11, wherein the latch part comprises a latch
portion and a supporting portion connected to the latch portion and the
top surface of the base, and the latch part has a Y-shaped cross section
before punching.

15. The method of claim 14, wherein the latch portion of the latch part
located between two neighboring fins is punched and distorted to be
T-shaped.

16. A heat dissipation device comprising: a base, a plurality of latch
parts projecting from a top surface of the base, a recess being defined
between every two neighboring latch parts; and a plurality of fins, each
fin defining a plurality of tenons at a bottom portion, each tenon
engaging with a corresponding recess, the latch parts located between two
neighboring fins being punched to make the fins fix on the base.

17. The heat dissipation device of claim 16, wherein each latch part
comprises a latch portion, and the latch portion has a V-shaped cross
section before punching.

18. The heat dissipation device of claim 17, wherein the latch portion of
the latch part located between two neighboring fins is punched and
distorted to be planar.

19. The heat dissipation device of claim 16, wherein the latch part
comprises a latch portion and a supporting portion connected to the latch
portion and the top surface of the base, and the latch part has a
Y-shaped cross section before punching.

20. The heat dissipation device of claim 19, wherein the latch portion of
the latch part located between two neighboring fins is punched and
distorted to be T-shaped.

Description:

BACKGROUND

[0001] 1. Technical Field

[0002] The disclosure relates to a heat dissipation device.

[0003] 2. Description of Related Art

[0004] A heat dissipation device is often applied to dissipate heat from
heat generating components, such as central procession units (CPUs).

[0005] Conventionally, a heat dissipation device includes a plurality of
fins made of aluminum and formed by extrusion type, a substrate arranged
under the fins, and a heat pipe arranged on the substrate and connected
to the fins and the heat pipe. The fins are soldered to the substrate and
the heat pipe via stannum. The heat dissipation efficiency of the heat
dissipation device is reduced since the thermal resistance of the stannum
between the fins and the substrate. Further, the fins need a soldering
process to fix on the substrate and the manufacture of the heat
dissipation device is costly.

[0006] Thus, it is desired to overcome the described limitations.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 is an assembled view of a heat dissipation device, according
to an exemplary embodiment of the present disclosure.

[0008] FIG. 2 is an inverted view of the heat dissipation device of FIG.
1.

[0009] FIG. 3 is an exploded, isometric view of the heat dissipation
device of FIG. 1.

[0010] FIG. 4 is a front elevational view of a base of the heat
dissipation device of FIG. 1.

[0011] FIG. 5 is a front elevational view of a fin of the heat dissipation
device of FIG. 1.

[0012] FIG. 6 is a cross-sectional view of the heat dissipation device of
FIG. 1, taken along line VI-VI thereof.

[0013]FIG. 7 is a cross-sectional view of the heat dissipation device
after punching a latch part of the base.

DETAILED DESCRIPTION

[0014] FIGS. 1, 2, 3 and 4 show a heat dissipation device 100 in
accordance with an exemplary embodiment. The heat dissipation device 100
includes a holder 10, a base 20, a fin set 30 and two U-shaped heat pipes
40 connected to the base 20 and the fin set 30.

[0015] The holder 10 is engaged with the base 20 to fix the base 20, the
fin set 30 and the heat pipes 40 for dissipating heat generated from
electronic elements.

[0016] The base 20 has a rectangle shape, and can be made of metal with
high thermal conductivity selected from a group consisting of copper,
aluminum and combination thereof. The base 20 includes a top surface 21
and a bottom surface 22 opposite to the top surface 21. A plurality of
latch part 23 project from the top surface 21 of the base 20 and extend
along a lengthwise direction of the base 20. Each latch part 23 includes
a latch portion 231 and a supporting portion 232 connected to the latch
portion 231 and the top surface 21 of the base 20. In the present
embodiment, a cross section view of the latch part 23 is a substantial
Y-shape, and a cross section view of the latch portion 231 is a
substantial V-shape. The latch part 23 is integrally formed with the base
20 as a single piece and formed by extrusion type. Height of the latch
portion 231 is larger than that of the supporting portion 232. A recess
24 is defined between every two neighboring latch parts 23. Each recess
24 includes a clasp recess 241 arranged between two neighboring latch
portions 231 and a connecting recess 242 arranged between the two
corresponding supporting portions 232. In the present embodiment, a cross
section of the clasp recess 241 is substantially wedged. A cross section
of the connecting recess 242 is rectangle-shaped. A width of the
connecting recess 242 is equal to a width of a largest portion of the
clasp recess 241. It can be understood that the latch part 23 can only
include the latch portion 231, a cross section of the latch portion 231
is a substantial V-shape, and bottom portion of the latch portion 231
engages with the top surface 21 of the base.

[0017] Two grooves 221 are defined in the bottom surface 22 of the base
20. The grooves 221 extend along the lengthwise direction of the base 20.
The two grooves 221 are respectively used to receive evaporation sections
42 of the two heat pipes 40. In the present embodiment, each evaporation
section 42 of the heat pipe 40 has an interference fit with the
corresponding groove 221 to fix the heat pipe 40 on the base 20. A bottom
surface (not labeled) of the heat pipe 40 is coplanar with the bottom
surface 22 of the base 20, and the bottom surface of the heat pipe 40 has
a thermally conductive relationship with an electronic element via a heat
conductor substrate 50. Two elongated cutouts 223 are defined in the
bottom surface 22 of the base 20. The cutouts 223 are located at two
opposite sides of the base 20 respectively, and extend along the
lengthwise direction of the base 20. The cutouts 223 are used for
engagingly receiving the holder 10.

[0018] Referring to FIG. 5 also, the fin set 30 includes a plurality of
fins 31 stacked together. Each fin 31 is parallel to and spaced from a
neighboring fin 31, and perpendicular with the top surface 21 of the base
20. The fin 31 is rectangle-shaped. A first flange 311 bents horizontally
from a top edge of the fin 31. Each first flange 311 is abutted against
the first flange 311 of a neighboring fin 31, and a passage (not labeled)
is defined between each two neighboring fins 31 for airflow flowing
through. Each fin 31 defines two through holes 312 at a top portion for
condensation sections 41 of heat pipe 40 extending through. Each through
hole 312 defines a sleeve 313 bents horizontally at opening thereof. A
plurality of tenons 32 are formed at a bottom portion of each fin 31. In
the present embodiment, each tenon 32 is wedged. The tenon 32 has a
configuration in complement with that of the recess 24. A second flange
321 bents horizontally from a bottom of each tenon 32. An extending
direction of the second flange 321 is the same as that of the first
flange 311. An extending length of the first flange 311 and the second
flange 321 is equal to or less than a distance between two neighboring
fins 31. Each second flange 321 abuts against a bottom of the recess 24.
In the present embodiment, each tenon 32 of fin 31 has an interferential
match with the corresponding recess 24 of the base to fix the fin 31 on
the base 20.

[0019] Referring to FIGS. 6 and 7 also, in assembly, the tenons 32 of each
the fin 31 are received in the recesses 24 of the base 20, respectively,
and the fins 31 engage with the base 20 one by one. Punching a part of
each latch part 23 located between two neighboring fins 31 downward to
the bottom surface 22 of the base 20 to make the part of the each latch
part 23 distort into a substantial T-shape. In other words, a part of the
V-shaped latch portion 231 is punched and distorted to flat, and a width
of the distorted latch portion 231 is larger than that of the original
latch portion 231; therefore, the fin 31 is firmly secured in the
recesses 24 of the base 20 via every two T-shaped latch parts 23 located
at two lateral sides of the fin 31, and the fin 31 cannot move along an
extending direction of the condensation sections 41. It is understood
that the part of each latch part 23 not be punched, which locates between
neighboring tenons 32 of the fin 31, still presents as its original
shape. And then, the evaporation sections 42 of the heat pipes 40
respectively extend through the grooves 221 of the base 20, and the
condensation section 41 of the heat pipe 40 respectively extend through
the through holes 312 of the fins 31. Pressing the evaporation sections
42 of the heat pipes 40 via a punch; therefore, each the evaporation
section 42 has a configuration in complement with that of the
corresponding groove 221, a bottom surface of the evaporation section 42
is coplanar to the bottom surface 22 of the base, and the evaporation
section 42 interferentially fits with the corresponding groove 221. At
last, the sleeve 313 of the corresponding through hole 312 is punched to
make the condensation section 41 of the heat pipe 40 fix on the fins 31.
In other embodiments, a single fin 31 engages with the base 20, the part
of the latch part 23 which is neighboring the fins 31 is punched to be
T-shaped, and then another fin 31 is installed via repeating the above
processes.

[0020] The fin set 30 is firmly secured on the base 20 via every two
T-shaped latch part 23 located at two lateral sides of each fin 31, and
the heat pipe 40 has a firmly interferential match with the fin set 30
and the base 20. Compared with the conventional heat dissipation device,
the present disclosure omits the process of soldering the base 20, the
fin set 30 and the heat pipe 30 together, and the heat dissipation device
100 still has high heat dissipation efficiency, a simple structure, an
easy operation, and a lower cost.

[0021] Referring to FIGS. 1-6, a method for assembling the heat
dissipation device 100 in accordance with an exemplary embodiment is also
disclosed. The method includes the following steps.

[0022] Step 1: a plurality of fins 31 is provided. A plurality of tenons
32 are formed at a bottom portion of each fin 31. Each tenon 32 is
wedged.

[0023] Step 2: a base 20 is provided. A plurality of latch part 23 project
from a top surface 21 of the base 20 and extend along a lengthwise
direction of the base 20. A recess 24 is defined between two neighboring
latch parts 23. Each latch part 23 includes a latch portion 231 and a
supporting portion 232 connected to the latch portion 231 and the top
surface 21 of the base 20. In the present embodiment, a cross section of
the latch part 23 is Y-shaped, and a cross section of the latch portion
231 is V-shaped. The recess 24 has a configuration in complement with
that of the tenon 32.

[0024] Step 3: the tenons 32 of each fin 31 are received in the recesses
24 of the base 20, and the fins 31 engage with the base 20 one by one.

[0025] Step 4: a part of each latch part 23 located between two
neighboring fins 31 are punched downward to a bottom surface 22 of the
base 20 to make the part of the each latch part 23 distorted into a
T-shape. In other words, the V-shaped latch portion 231 of the each latch
part 23 between two neighboring fins 31 is distorted to form a T-shaped
latch portion 231, whereby the distorted part of latch portion 231 is
flat, and a width of the distorted part of latch portion 231 is larger
than that of the original latch portion 231. Therefore, the fin 31 is
firmly secured on the recesses 24 of the base 20 via the two T-shaped
latch part 23 located at two lateral sides of the fin 31.

[0026] It is to be further understood that even though numerous
characteristics and advantages have been set forth in the foregoing
description of embodiments, together with details of the structures and
functions of the embodiments, the disclosure is illustrative only; and
that changes may be made in detail, especially in matters of shape, size,
and arrangement of parts within the principles of the disclosure to the
full extent indicated by the broad general meaning of the terms in which
the appended claims are expressed.